metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pinkish in color, with a vitreous to greasy luster and a non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pinkish in color, with a vitreous to greasy luster and a non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, commonly occurring during tectonic mountain-building events.
Uses & applications
Used extensively as crushed stone for road construction, railroad ballast, and as a decorative building stone or countertop material.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identified in the field by its inability to be scratched by a knife and the way it fractures across quartz grains rather than around them. Found globally in ancient mountain belts.
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